Comprehensive Description

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Description of Johenrea

The type species is J. locustae Lange, Becnel, Razafindratiana, Przybyszewski and Razafindra-fara, 1996 in adipose tissue xenomas, especially around the digestive tract of Locusta migratoria capito (Orthoptera, Acrididae). The xenoma wall is composed of a basement membrane, within which are collagen fibres in concentric layers. Several host cell nuclei are present in each xenoma, indicating a syncytium or division of the nucleus of one cell. Monomorphic, monokaryotic throughout life cycle. Meiosis unknown. Transmission by ingestion of spores. Merogony: binary fission of binucleate or paucinucleate meronts. Sporogony: sporogonial plasmodia become 8- or 16-nucleate and a sporophorous vesicle composed of a dense membrane with tubular excrescences separates from the plasma membrane. Division within the vesicle occurs by plasmotomy to produce tetranucleate plasmodia which undergo two further divisions to give 8 or 16 uninucleate sporoblasts. Episporontal space usually uniformly lucent, occasionally with long tubules. Spores: 8.3 x 3.8 µm (fresh), elongate ovoid, sometimes slightly curved. Polaroplast extensive, composed of lamellar and vesicular regions. Polar tube isofilar with 12 coils in a single rank. Nucleus lies within the polar tube coil. Prominent posterior vacuole.

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